Through channel supporting tool

Abstract

The utility model provides a through channel supporting tool, which belongs to the technical field of railway vehicles and comprises a fixing plate, a supporting piece, a reinforcing piece and a bearing pad, and the fixing plate is mounted on a carriage bottom plate seat in a butt joint manner and is provided with a fixing assembly; the supporting piece is horizontally arranged, and one end of the supporting piece is fixedly installed on the fixing plate. The other end extends towards the end part of the carriage; the through channel is used for being supported on a supporting plate. The reinforcing piece is obliquely arranged and is positioned below the supporting piece; one end of the reinforcing part is fixedly mounted on the fixing plate, a mounting distance is formed between the reinforcing part and one end of the supporting part, and the other end of the reinforcing part is fixedly connected with the other end of the supporting part; the bearing pad is fixedly installed on the side, away from the fixing plate, of the upper end of the supporting piece. The lower end of the through channel abuts against the bearing pad. According to the through channel supporting tool provided by the utility model, the through channel does not need to be detached from the carriage for connection, so that the overhaul operation steps of the through channel are simplified, and the maintenance working efficiency of a railway vehicle is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail vehicles, and more specifically, relates to a through-channel supporting tooling. Background Art

[0002] The gangway is an important part connecting two carriages. It can play a role in safety protection, provide passengers with a safe and reliable passage, and also play a role in sound insulation, dust prevention, and rain protection. In order to ensure the safety and stability of rail vehicles during operation, the gangway needs to be dismantled and inspected during maintenance of rail vehicles to ensure the safe and reliable use of the gangway. The current method of dismantling the gangway from the carriage requires multiple staff members to operate together, and the steps are relatively cumbersome. After the inspection is completed, the gangway needs to be installed on the carriage. The entire operation process is time-consuming and labor-intensive, which reduces the efficiency of rail vehicle maintenance. Utility Model Content

[0003] The utility model aims to provide a gangway support tooling to solve the technical problem in the prior art that the operation steps in the gangway maintenance process are relatively complicated, resulting in low efficiency of rail vehicle maintenance work.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a through-channel support tooling, including:

[0005] The fixing plate is arranged vertically and is butt-mounted on the carriage floor seat; the fixing plate is provided with a fixing assembly for fixing the fixing assembly with the carriage floor seat;

[0006] The support member is arranged horizontally, and one end of the support member is fixedly mounted on the fixing plate; the other end of the support member extends toward the end of the carriage; the through passage is used to be supported on the support plate;

[0007] The reinforcement member is arranged obliquely and is located below the support member; one end of the reinforcement member is fixedly mounted on the fixing plate and has a mounting spacing with one end of the support member, and the other end of the reinforcement member is fixedly connected to the other end of the support member;

[0008] A bearing pad is fixedly mounted on a side of the upper end of the support member away from the fixing plate; and the lower end of the through passage abuts against the bearing pad.

[0009] In a possible implementation, the support member includes a plurality of support rods arranged in parallel and spaced apart from each other and a first connecting rod installed between two of the support rods, one end of the support rod is fixedly connected to the fixing plate; the two ends of the first connecting rod are respectively fixedly connected to the two support rods; and the bearing pad is installed on the two support rods.

[0010] In a possible implementation, a threaded hole is provided on the support rod or the first connecting rod, a through hole corresponding to the threaded hole is provided on the bearing pad, and the bearing pad and the support rod or the first connecting rod are fixedly connected by bolts.

[0011] In a possible implementation, the reinforcement member includes two inclined rods arranged in parallel and at intervals, and the two inclined rods correspond to the two support rods one by one; two ends of the inclined rod are respectively fixedly connected to the fixing plate and the support rod.

[0012] In a possible implementation, the reinforcement member further includes two second connecting rods respectively installed between the support rod and the corresponding tilting rod; the second connecting rod is vertically arranged, and two ends are respectively fixedly connected to the support rod and the tilting rod.

[0013] In a possible implementation, the support member also includes a third connecting rod fixedly installed between the two support rods, the first connecting rod is installed at one end of the support rod away from the fixed plate, and the third connecting rod is installed between the first connecting rod and the fixed plate; the through-channel support tooling also includes a longitudinal support rod and a clamping block, the longitudinal support rod is located below the first connecting rod and the third connecting rod, and one end of the longitudinal support rod is rotatably connected to the first connecting rod, the clamping block is fixedly installed at the lower end of the third connecting rod, and the lower end of the clamping block is opened in a clamping groove for clamping the longitudinal support rod.

[0014] In one possible implementation, the longitudinal support rod includes a mounting sleeve, a screw and a locking nut. One end of the mounting sleeve is rotatably connected to the first connecting rod, and an internal thread section is provided on the inner wall. The screw is threadedly connected to the mounting sleeve for adjusting the relative position of the screw and the mounting sleeve. The locking nut is threadedly connected to the screw for locking and fixing the screw and the mounting sleeve.

[0015] In a possible implementation, the bearing pad is a nylon plate.

[0016] In a possible implementation, a plurality of penetrating connection holes are provided on the vehicle floor seat, and the fixing assembly includes a plurality of studs and a plurality of locking nuts, and the plurality of studs correspond one-to-one to the plurality of connection holes; the length of the studs is greater than the length of the connection holes, the studs are passed through the corresponding connection holes, and are fixedly connected using the locking nuts.

[0017] In a possible implementation, a through limiting hole is provided on the outer side surface of the stud, and the limiting hole is located on the side of the vehicle floor seat away from the fixing plate; the fixing assembly also includes a limiting pin for being installed in the limiting hole.

[0018] The beneficial effects of the through-passage support tooling provided by the utility model are as follows: compared with the prior art, the through-passage support tooling of the utility model, after separating two adjacent carriages, the fixing plate is butt-jointed and installed on the carriage floor seat, and the fixing plate is fixedly connected to the carriage floor seat through a fixing assembly; the support member is supported from bottom to top on the lower end surface of the through-passage, thereby forming support for the through-passage, and under the action of the inclined reinforcement member, the support member is in a stable state, so that the through-passage is firmly connected to the carriage, and the staff can stand on the through-passage for inspection and maintenance; at the same time, a bearing pad is arranged at the upper end of the support member, and the lower end of the through-passage is directly in contact with the bearing pad, so that no mutual damage occurs between the through-passage and the support member; in this way, when inspecting the through-passage, there is no need to disassemble the through-passage from the carriage and connect it, and with the help of the fixing plate, the support member and the reinforcement member, the staff can stand on the through-passage safely and stably to work, which simplifies the inspection and maintenance operation steps of the through-passage and improves the maintenance work efficiency of the rail vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A front view of a tunnel support tooling provided in an embodiment of the utility model;

[0021] Figure 2 A top view of a through-channel support tooling provided in an embodiment of the utility model;

[0022] Figure 3 A side view of a through-channel support tooling provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the connection between the support member and the fixing plate provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of the pad provided in the embodiment of the utility model;

[0025] Figure 6 A schematic diagram of the structure of a clamping block provided in an embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the structure of a longitudinal support rod provided in an embodiment of the utility model;

[0027] Figure 8 A schematic diagram of the connection between the longitudinal support rod and the first connecting rod and the third connecting rod provided in an embodiment of the utility model;

[0028] Fig. 9 A schematic structural diagram of a through-channel support tooling with connections provided in an embodiment of the utility model.

[0029] Among them, the reference numerals in the figure are:

[0030] 1. Fixing plate; 11. Fixing assembly; 12. Stud; 13. Limiting hole; 2. Support member; 21. Support rod; 22. First connecting rod; 23. Third connecting rod; 24. Clamping block; 25. Slot; 26. Elastic pad; 27. Threaded hole; 3. Reinforcement member; 31. Tilting rod; 32. Second connecting rod; 4. Bearing pad; 41. Through hole; 42. Bolt; 5. Longitudinal support rod; 51. Mounting sleeve; 52. Screw; 53. Locking nut; 54. Pad. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] See also Figures 1 to 5 Now, the through-channel support tooling provided by the utility model is described. A through-channel support tooling includes a fixing plate 1, a support member 2, a reinforcement member 3 and a bearing pad 4. The fixing plate 1 is vertically arranged and butt-mounted on the car body floor seat; the fixing plate 1 is provided with a fixing assembly 11 for fixed connection with the car body floor seat; the support member 2 is horizontally arranged, and one end is fixedly mounted on the fixing plate 1; the other end extends toward the end of the car body; the through-channel is used to support the support plate; the reinforcement member 3 is inclinedly arranged and located below the support member 2; one end of the reinforcement member 3 is fixedly mounted on the fixing plate 1, and has an installation spacing with one end of the support member 2, and the other end of the reinforcement member 3 is fixedly connected to the other end of the support member 2; the bearing pad 4 is fixedly mounted on the side of the upper end of the support member 2 away from the fixing plate 1; the lower end of the through-channel abuts against the bearing pad 4.

[0036] Compared with the prior art, the through-passage support tooling provided by the utility model is as follows: after separating two adjacent carriages, the fixing plate 1 is docked and installed on the carriage floor seat, and the fixing plate 1 is fixedly connected to the carriage floor seat through the fixing assembly 11; the support member 2 is supported on the lower end surface of the through-passage from bottom to top, thereby forming support for the through-passage, and under the action of the inclined reinforcement member 3, the support member 2 is in a stable state, so that the through-passage is firmly connected to the carriage, and the staff can stand on the through-passage for maintenance; at the same time, a bearing pad 4 is arranged at the upper end of the support member 2, and the lower end of the through-passage is directly in contact with the bearing pad 4, so that no mutual damage occurs between the through-passage and the support member 2; in this way, when the through-passage is repaired, there is no need to disassemble the through-passage from the carriage and connect it, and with the help of the fixing plate 1, the support member 2 and the reinforcement member 3, the staff can stand on the through-passage safely and stably to work, which simplifies the maintenance operation steps of the through-passage and improves the maintenance work efficiency of the rail vehicle.

[0037] The support member 2 and the reinforcement member 3 are provided with square tubes, and the fixing plate 1 is provided with steel plates. Anti-rust primer is applied to the outer surface of the entire through-channel support tooling.

[0038] See also Figure 1 , Figure 2 and Figure 4As a specific embodiment of the through-channel support tooling provided by the utility model, the support member 2 includes a plurality of support rods 21 arranged in parallel and spaced apart and a first connecting rod 22 installed between two support rods 21, one end of the support rod 21 is fixedly connected to the fixed plate 1; the two ends of the first connecting rod 22 are respectively fixedly connected to the two support rods 21; the bearing pad 4 is installed on the two support rods 21; the two support rods 21 are arranged in parallel and spaced apart, and the upper ends are located on the same plane, and the first connecting rod 22 is provided between the two support rods 21, so that the two support rods 21 are firmly connected together; the bearing pad 4 is fixedly installed on the upper ends of the two support rods 21; one end of the two support rods 21 is fixedly connected to the upper part of one side of the fixed plate 1, and the reinforcement member 3 is located below the two support rods 21, and the upper end of the reinforcement member 3 is fixedly connected to the end of the support rod 21 away from the fixed plate 1, and the lower end is fixedly connected to the lower part of one side of the fixed plate 1, so as to stably support the through-channel. With the help of the two first connecting rods 22, the two support members 2 are accurately and firmly installed.

[0039] See also Figure 1 , Figure 4 and Figure 5 As a specific embodiment of the through-channel support tooling provided by the utility model, a threaded hole 27 is provided on the support rod 21 or the first connecting rod 22, and a through hole 41 corresponding to the threaded hole 27 is provided on the bearing pad 4, and the bearing pad and the support rod 21 or the first connecting rod 22 are fixedly connected by a bolt 42; when installing the bearing pad 4, the bearing pad 4 is installed on the two support rods 21, and the through hole 41 on the bearing pad 4 is coaxially aligned with the threaded hole 27 on the support rod 21 or the first connecting rod 22, and then the bolt 42 is passed through the through hole 41 and threadedly connected with the threaded hole 27, so that the bearing pad 4 is fixedly connected with the support rod 21 or the first connecting rod 22. The through hole 41 is set as a countersunk hole, so that the bolt 42 is hidden in the through hole 41 to avoid collision between the bolt 42 and the through-channel.

[0040] See also Figure 1 As a specific embodiment of the through-passage support tooling provided by the utility model, the reinforcement member 3 includes two inclined rods 31 arranged in parallel and spaced apart, and the two inclined rods 31 correspond to the two support rods 21 one by one; the two ends of the inclined rods 31 are respectively fixedly connected to the fixing plate 1 and the support rod 21; the two inclined rods 31 are respectively located below the two support rods 21, and the two ends of one inclined rod 31 are respectively fixedly connected to the support rod 21 and the fixing plate 1, so that the support rod 21 is stable and safe to use; similarly, the two ends of the other inclined rod 31 are respectively fixedly connected to the other support rod 21 and the fixing plate 1, so that the other support rod 21 is stable and safe to use. In this way, the two support rods 21 are supported by the two inclined rods 31, so that the two support rods 21 support the through-passage safely and stably.

[0041] See also Figure 1 As a specific implementation of the through-channel supporting tooling provided by the utility model, the reinforcement member 3 also includes two second connecting rods 32, which are respectively installed between the support rod 21 and the corresponding inclined rod 31; the second connecting rod 32 is vertically arranged, and the two ends are respectively fixedly connected to the support rod 21 and the inclined rod 31; the two second connecting rods 32 are respectively located in the gap between the support rod 21 and the inclined rod 31, and the upper end of the second connecting rod 32 is fixedly connected to the lower end of the support rod 21, and the lower end of the second connecting rod 32 is fixedly connected to the upper end of the inclined rod 31, and the inclined rod 31 and the support rod 21 are connected by means of the second connecting rod 32, so that the support rod 21 is more securely supported.

[0042] See also Figures 6 to 9 As a specific embodiment of the through-channel support tooling provided by the utility model, the support member 2 also includes a third connecting rod 23 fixedly installed between the two support rods 21, the first connecting rod 22 is installed at one end of the support rod 21 away from the fixed plate 1, and the third connecting rod 23 is installed between the first connecting rod 22 and the fixed plate 1; the through-channel support tooling also includes a longitudinal support rod 5 and a clamping block 24, the longitudinal support rod 5 is located below the first connecting rod 22 and the third connecting rod 23, and one end of the longitudinal support rod 5 is rotatably connected to the first connecting rod 22, the clamping block 24 is fixedly installed at the lower end of the third connecting rod 23, and the lower end of the clamping block 24 is provided in a clamping groove 25 for clamping the longitudinal support rod 5; the first connecting rod 22 and the third connecting rod 23 are both located between the two support rods 21, and are arranged in parallel and spaced apart. A rotation hole is provided on the first connecting rod 22, and a clamping block 24 is provided on the third connecting rod 23. When the longitudinal support rod 5 is not in use, the longitudinal support rod 5 is in a horizontal state, and one end is rotatably connected to the first connecting rod 22, and the middle position is connected to the clamping block 24 on the third connecting rod 23. The clamping slot 25 on the clamping block 24 is tightly fitted and installed with the outer side of the longitudinal support rod 5 to keep the longitudinal support rod 5 in a stable state. When the longitudinal support rod 5 needs to be used, the staff manipulates the longitudinal support rod 5 to change from a horizontal state to a longitudinal state, and the lower end of the longitudinal support rod 5 is supported on the ground so that the support member 2 can support the through passage more safely and securely. A rotating shaft that cooperates with the connecting shaft of the rotating hole is provided at one end of the longitudinal support rod 5. An elastic pad 26 is arranged in the clamping slot 25 to improve the connection stability between the longitudinal support rod 5 and the clamping block 24.

[0043] The first connecting rod 22, the second connecting rod 32 and the third connecting rod 23 are all made of square tubes.

[0044] See also Figures 7 to 9As a specific embodiment of the through-channel support tooling provided by the utility model, the longitudinal support rod 5 includes a mounting sleeve 51, a screw rod 52 and a locking nut 53. One end of the mounting sleeve 51 is rotatably connected to the first connecting rod 22, and an internal thread section is provided on the inner wall. The screw rod 52 is threadedly connected to the mounting sleeve 51 for adjusting the relative position of the screw rod 52 and the mounting sleeve 51. The locking nut 53 is threadedly connected to the screw rod 52 for locking and fixing the screw rod 52 and the mounting sleeve 51. When in use, the mounting sleeve 5 1 is vertically arranged, and the upper end is rotatably connected with the first connecting rod 22, and then the screw rod 52 is connected from bottom to top in the installation sleeve 51, and forms a threaded connection with the installation sleeve 51; the screw rod 52 is manipulated to be screwed in the installation sleeve 51 to adjust the position of the screw rod 52, so that the lower end of the screw rod 52 is stably and reliably supported on the ground, and the support member 2 works smoothly; finally, the locking nut 53 is screwed to lock and fix the screw rod 52 on the installation sleeve 51, so as to realize the stable support between the installation sleeve 51 and the screw rod 52. The lower end of the screw rod 52 is provided with a pad 54 for increasing the contact area.

[0045] See also Figure 1 and Figure 2 As a specific embodiment of the through-channel support tooling provided by the utility model, the bearing pad 4 is a nylon plate, which is in direct contact with the through-channel, so the through-channel can be effectively and stably supported, and damage to the through-channel can be avoided. At the same time, the nylon plate has good wear resistance, and the surface wear of the bearing pad 4 is small, so that the upper end surface of the bearing pad 4 can remain flat and smooth for a long time, so that the pipe channel can be accurately and firmly supported.

[0046] See also Figures 1 to 3 As a specific embodiment of the through-channel support tooling provided by the utility model, a plurality of through-connecting holes are provided on the car floor seat, and the fixing assembly 11 includes a plurality of studs 12 and a plurality of locking nuts 53, and the plurality of studs 12 correspond to the plurality of connecting holes one by one; the length of the studs 12 is greater than the length of the connecting holes, and the studs 12 are inserted into the corresponding connecting holes and fixedly connected using the locking nuts 53; the connecting holes are arranged horizontally, and the studs 12 are fixed to the side of the fixing plate 1 close to the car floor seat, so when the fixing plate 1 is installed on the car floor seat, the fixing plate 1 is docked with the car floor assembly, and the studs 12 are installed in cooperation with the corresponding connecting holes and inserted into the connecting holes, and finally the locking nuts 53 are screwed on the studs 12 to realize the fixed connection between the fixing plate 1 and the car floor seat. The plurality of connecting holes and the plurality of studs 12 are arranged in a rectangular array.

[0047] See also Figures 1 to 3As a specific embodiment of the through-channel support tooling provided by the utility model, a through-limiting hole 13 is provided on the outer side surface of the stud 12, and the limiting hole 13 is located on the side of the car floor seat away from the fixing plate 1; the fixing assembly 11 also includes a limiting pin for being installed in the limiting hole 13; the distance between the limiting hole 13 and the fixing plate 1 is set to be greater than the axial length of the connecting hole. After the stud 12 is installed in the connecting hole, the limiting hole 13 is located on the side of the car floor seat away from the fixing plate 1, and then the limiting pin is used to penetrate the limiting hole 13, further providing good and stable protection between the fixing plate 1 and the car floor seat. After the locking nut 53 fails, the limiting pin can still keep the support member 2 and the through-channel in a stable state.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gangway support tooling, characterized in that: include: The fixing plate is arranged vertically and is butt-mounted on the carriage floor seat; the fixing plate is provided with a fixing assembly for fixing the fixing assembly with the carriage floor seat; The support member is arranged horizontally, and one end of the support member is fixedly mounted on the fixing plate; the other end of the support member extends toward the end of the carriage; the through passage is used to be supported on the support plate; The reinforcement member is arranged obliquely and is located below the support member; one end of the reinforcement member is fixedly mounted on the fixing plate and has a mounting spacing with one end of the support member, and the other end of the reinforcement member is fixedly connected to the other end of the support member; A bearing pad is fixedly mounted on a side of the upper end of the support member away from the fixing plate; and the lower end of the through passage abuts against the bearing pad.

2. The through-channel support tooling according to claim 1, characterized in that: The support member includes a plurality of support rods arranged in parallel and at intervals and a first connecting rod installed between two of the support rods, one end of the support rod is fixedly connected to the fixing plate; the two ends of the first connecting rod are respectively fixedly connected to the two support rods; the bearing pad is installed on the two support rods.

3. The through-channel support tooling according to claim 2, characterized in that: The support rod or the first connecting rod is provided with a threaded hole, the bearing pad is provided with a through hole corresponding to the threaded hole, and the bearing pad and the support rod or the first connecting rod are fixedly connected by bolts.

4. The through-channel support tooling according to claim 2, characterized in that: The reinforcement member includes two inclined rods arranged in parallel and at intervals, and the two inclined rods correspond to the two support rods one by one; two ends of the inclined rod are respectively fixedly connected to the fixing plate and the support rod.

5. The through-channel support tooling according to claim 4, characterized in that: The reinforcement also includes two second connecting rods, which are respectively installed between the support rod and the corresponding tilting rod; the second connecting rod is vertically arranged, and the two ends are fixedly connected to the support rod and the tilting rod respectively.

6. The through-channel support tooling according to any one of claims 2 to 5, characterized in that: The support member also includes a third connecting rod fixedly installed between the two support rods, the first connecting rod is installed at one end of the support rod away from the fixed plate, and the third connecting rod is installed between the first connecting rod and the fixed plate; the through-channel support tooling also includes a longitudinal support rod and a clamping block, the longitudinal support rod is located below the first connecting rod and the third connecting rod, and one end of the longitudinal support rod is rotatably connected to the first connecting rod, the clamping block is fixedly installed at the lower end of the third connecting rod, and the lower end of the clamping block is opened in a clamping groove for clamping the longitudinal support rod.

7. The through-channel support tooling according to claim 6, characterized in that: The longitudinal support rod includes a mounting sleeve, a screw and a locking nut. One end of the mounting sleeve is rotatably connected to the first connecting rod, and an internal thread section is provided on the inner wall. The screw is threadedly connected to the mounting sleeve for adjusting the relative position of the screw and the mounting sleeve. The locking nut is threadedly connected to the screw for locking and fixing the screw and the mounting sleeve.

8. The through-channel support tooling according to claim 1, characterized in that: The bearing pad is a nylon plate.

9. The through-channel support tooling according to claim 1, characterized in that: A plurality of penetrating connection holes are provided on the carriage floor seat, and the fixing assembly includes a plurality of studs and a plurality of locking nuts, and the plurality of studs correspond one to one with the plurality of connection holes; the length of the studs is greater than the length of the connection holes, and the studs are passed through the corresponding connection holes and fixedly connected using the locking nuts.

10. The through-channel support tooling according to claim 9, characterized in that: A through-limiting hole is provided on the outer side of the stud, and the limiting hole is located on the side of the carriage floor seat away from the fixing plate; the fixing assembly also includes a limiting pin shaft for being installed in the limiting hole.

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